BMW 5 Series missing gears

I have a BMW 5 Series diesel (2009 model) and have noticed that the auto box is missing a gear. It is also making a piercing screeching noise. Lifting the power it seemed to quietened down. I was wondering if it was gearbox or torque converter? Any thoughts?

Asked on 9 April 2015 by Chris

Answered by Honest John
Sounds like it. Get it to a member of Could also be the alternator or the water pump, but if it is one of those it would occur if you revved the engine while the transmission was in Park or Neutral.
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